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NOZZLE RING OPEN CROSS SECTION NI-HARD 4
The nozzle ring part is an important component of the coal mill, which is to change the primary hot air static pressure into dynamic pressure and effectively improve the aerodynamic field inside the coal mill. The nozzle ring consists of a rotating part and a stationary part. The rotating portion (moving ring) is bolted to the millplate seat and rotates with the millplate. The stationary part consists of a static ring and a retaining ring. The static ring is fixed to the mill frame body, and the retaining ring is bolted to the static ring.
The moving ring and static ring are formed. By changing the original sealing method and combined with the wear-resistant material, it can ensure the static gap and reduce the air leakage and air. The primary wind is used efficiently to carry and dry the pulverized coal more effectively to ensure the output of the coal mill.
The main material is: nickel hard cast iron high chromium alloy
Nickel hard cast iron is a cast iron material with high hardness and high wear resistance.
1. Characteristics of the nickel hard cast iron material
Nickel hard cast iron refers to the cast iron material that adds the appropriate amount of nickel, molybdenum and other alloy elements on the basis of grey cast iron, and obtains high hardness, high toughness and wear resistance through heat treatment. Its characteristics mainly include the following aspects:
1. High hardness: The hardness of nickel hard cast iron is more than twice higher than that of general gray cast iron, which can reach 600 HB or above.
2. High toughness: nickel hard cast iron material still has good toughness under the condition of high hardness, which can effectively prevent fracture or cracking phenomenon.
3. High wear resistance: due to the high surface hardness and good wear resistance of nickel hard cast iron, the time and capital cost of maintenance and replacement of parts can be greatly reduced.
4. Excellent corrosion resistance: nickel hard cast iron material has a very good corrosion resistance, especially suitable for use in harsh environments.
| Chemical composition (Mass fraction) of Nickel Hard white cast iron from Inco. | ||||||||
| 牌 号 | C | Si | Mn | S | P | Ni | Cr | M0 |
| Ni-Hard 1 | 3.0～3.6 | 0.3～0.5 | 0.3～0.7 | ≤0.15 | ≤0.30 | 3.3～4.8 | 1.5～2.6 | 0～0.4 |
| Ni-Hard 2 | ≤2.9 | 0.3～0.5 | 0.3 ~0.7 |
≤0.15 | ≤0.30 | 3.3～5.0 | 1.4～2.4 | 0～0.4 |
| Ni-Hard 3 | 1.0～1.6 | 0.4～0.7 | 0.4～0.7 | ≤0.05 | ≤0.05 | 4.0～4.75 | 1.4～1.8 | |
| Ni-Hard 4 | 2.6～3.2 | 1.8～2.0 | 0.4～0.6 | ≤0.1 | ≤0.06 | 5.0～6.5 | 8.0～9.0 | 0～0.4 |
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注：1.Ni-Hard 1相当于 BTMNi4Cr2-GT (中国) 和 Ni-Cr-Hc (美国)
2.Ni-Hard 2相当于BTMNi4Cr2-DT ( 中国)和Ni-Cr-Lc(美国) 3.Ni-Hard 4相当于BTMCr9Ni5 (中国)和Ni-HiCr(美国) |
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